A Novel Controller Based on Single-Phase Instantaneous p-q Power Theory for a Cascaded PWM Transformer-less STATCOM for Voltage Regulation

Document Type: Research paper

Authors

1 2Department of Electrical Engineering, Urmia University, Urmia, Iran

2 faculty of engineering, urmia university,

Abstract

In this paper, dynamic performance of a transformerless cascaded PWM static synchronous shunt compensator (STATCOM) based on a novel control scheme is investigated for bus voltage regulation in a 6.6kV distribution system. The transformerless STATCOM consists of a thirteen-level cascaded H-bridge inverter, in which each voltage source H-bridge inverter should be equipped with a floating and isolated capacitor without any power source. The proposed control algorithm uses instantaneous p-q power theory in an innovative way that devotes itself not only to meet the reactive power demand but also to balance the dc link voltages at the same time. DC link voltage balancing control consists of two main parts: cluster and individual balancing. The control algorithm based on a phase shifted carrier modulation strategy has no restriction on the number of cascaded voltage source H-bridge inverters. Comprehensive simulations are presented in MATLAB/ SIMULINK environment for validating the performance of proposed transformerless STATCOM.

Keywords

Main Subjects


[1]     B. Singh, V. S. Kadagala, “A new configuration of two-level 48-pulse VSCs based STATCOM for voltage regulation,” Electr. Power Syst. Res., vol. 82, no. 1, pp. 11-17, 2012.

[2]     B. Singh, B. Singh, A. Chandra, K. Al-Haddad, “Digital implementation of an advanced static compensator for voltage profile improvement, power-factor correction and balancing of unbalanced reactive loads,” Electr. Power Syst. Res., vol. 54, no. 2, pp. 101-111, May 2000.

[3]     N. Bigdeli, E. Ghanbaryan, K. Afshar, “Low frequency oscillations suppression via cpso based damping controller,” J. Oper. Autom. Power Eng., vol. 1, no. 2, pp. 22-32, 2013.

[4]     H. Shayeghi, A. Ghasemi, “FACTS devices allocation using a novel dedicated improved PSO for optimal operation of power system,” J. Oper. Autom. Power Eng., vol. 1, no. 1, pp. 124-135, 2013.

[5]     R. Kazemzadeh, M. Moazen, R. Ajabi-Farshbaf, M. Vatanpour, “STATCOM optimal allocation in transmission grids considering contingency analysis in OPF using BF-PSO algorithm,” J.  Oper. Autom. Power Eng., vol. 1, no. 1, pp. 1-11, 2013.

[6]     I. Colak, Kabalci, E., Bayindir, R., “Review of multilevel voltage source inverter topologies and control schemes,” Energy Convers. Manage., vol. 52, pp. 1114-1128, 2011.

[7]     E. Babaei, S. Laali, M.B.B. Sharifian, “Reduction the number of power electronic devices of a cascaded multilevel inverter based on new general topology,” J. Oper. Autom. Power Eng., vol. 2, no. 2, pp. 81-90, 2014.

[8]     M. Farhadi Kangarlu, E. Babaei, F. Blaabjerg, “An LCL-filtered single-phase multilevel inverter for grid integration of PV systems,” J. Oper. Autom. Power Eng., vol. 4, no. 1, pp. 54-65, 2016.

[9]     H. Akagi, S. Inoue, T. Yoshii, “Control and performance of a transformerless cascade PWM STATCOM with star configuration,” IEEE Trans. Ind. Appl., vol. 43, pp. 1041-1049, 2007.

[10]  H. Mohammadi, M. T. Bina, “A transformerless medium-voltage STATCOM topology based on extended modular multilevel converters,” IEEE Trans. Power Electron., vol. 26, pp. 1534-1545, 2011.

[11]  H. Akagi, H. Fujita, S. Yonetani, and Y. Kondo, “A 6.6-kV transformerless STATCOM based on a five-level diode-clamped PWM converter: system design and experimentation of a 200-V 10-kVA laboratory model,” IEEE Trans. Ind. Appl., vol. 44, no. 2, pp. 672-680, 2008.

[12]  M. Abbasi and B. Tousi, “Novel controllers based on instantaneous p-q power theory for transformerless SSSC and STATCOM,” In Proc. IEEE Int. Conf. Environ. Electr. Eng. Ind. Commer. Power Syst. Eur., Milan, Italy, 2017.

[13]  H. Stemmler, A. Beer, H. Okayama, “Transformerless reactive series compensators with voltage source inverters,” IEEJ Trans. Ind. Appl., vol. 118, no. 10, pp. 1165–1171, 1998.

[14]  F. Z. Peng, S. Zhang, S. Yang, D. Gunasekaran, U. Karki, “Transformerless unified power flow controller using the cascade multilevel inverter,” Proc. Int. Power Electron. Conf., Hiroshima, 2014, pp. 1342-1349.

[15]  T. J. Hammons, “Mitigating Climate Change with Renewable and High-Efficiency Generation,” Electr. Power Compon. Syst., vol. 29, no. 9, pp. 849–865, 2001.

[16]  P. Gopakumar, M. J. bharata Reddy, and D. kumar Mohanta, “Letter to the editor: stability concerns in smart grid with emerging renewable energy technologies,” Electr. Power Compon. Syst., vol. 42, no. 3-4, pp. 418-425, 2014.

[17]  H. Akagi, Y. Kanazawa and A. Nabae, “Generalized theory of the instantaneous reactive power in three-phase circuits,” Proc. Int. Power Electron. Conf., Tokyo, Japan, 1983, pp. 1375-1386.

[18]  H. Akagi, Y. Kanazawa, A. Nabae, “Instantaneous reactive power compensator comprising switching devices without energy storage components,” IEEE Trans. Ind. Appl., vol. IA-20, pp. 625-630, 1984.

[19]  M. Y. Lada, O. Mohindo, A. Khamis, J. M. Lazi, and I. W. Jamaludin, “Simulation single phase shunt active filter based on p-q technique using MATLAB/Simulink development tools environment,” IEEE Appl. Power Electron. Colloquium, pp. 159-164 2011.

[20]  D. Sutanto, L. A. Snider, and K. L. Mok, “EMTP simulation of a STATCOM using hysteresis current control,” In Proc. IEEE Int. Conf. Power Electron. Drive Syst., Vol. 1, pp. 531-5351999.